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.. highlight:: cpp
.. _lang-increment:
Increment and Decrement Operators (``++``, ``--``)
==================================================
These operators increment (add one to) or decrement (subtract one
from) a variable. If they come before the variable, they return its
new value; otherwise, they return its old value.
Some quick examples::
x++; // adds one to x, and returns the old value of x
++x; // adds one to x, and returns the new value of x
x--; // decrement x by one and returns the old value of x
--x; // decrement x by one and returns the new value of x
A more extended example::
x = 2;
y = ++x; // x now contains 3, y contains 3
y = x--; // x contains 2 again, y still contains 3
.. warning:: Be careful! You cannot put a space in between the two
``+`` or ``-`` signs. This example is broken::
// this line won't compile (notice the extra space):
int y = x+ +;
See Also
--------
- :ref:`lang-compoundarithmetic`
.. include:: cc-attribution.txt
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